PHP's date_get_last_errors() Function

Are you tired of dealing with date-related errors in your PHP code? If so, you're in luck. PHP's date_get_last_errors() function is here to help.

In this article, we'll take a deep dive into how the date_get_last_errors() function works, its various parameters, and how you can use it to troubleshoot date-related issues in your PHP code.

What is the date_get_last_errors() Function?

The date_get_last_errors() function is a built-in PHP function (available since PHP 5.2.0) that allows you to retrieve information about the last date-related error or warning that occurred. It returns an associative array containing warning_count, warnings, error_count, and errors, which provide the specific codes and textual descriptions of what went wrong during the last date/time operation.

How to Use date_get_last_errors()

To use the date_get_last_errors() function, you call it after a date creation or modification function fails. For production-ready code, you should always verify that the date function returned false before retrieving the error details. Here's an example:

In this example, we're attempting to create a date object from the string '2022-13-01', which is an invalid date value (month 13 does not exist). After checking that date_create_from_format() returned false, we call date_get_last_errors() and print the returned array using print_r().

The output of this code will be:

Array
(
    [warning_count] => 1
    [warnings] => Array
        (
            [10] => The parsed date was invalid
        )

    [error_count] => 0
    [errors] => Array
        (
        )

)

As you can see, the returned array distinguishes between warnings and errors:

• Errors mean the input could not be parsed at all (for example, a stray character or a format that does not match the string).
• Warnings mean the string was parsed, but the result is questionable — such as an out-of-range component. Month 13 does not exist, so PHP wraps or rejects it and raises the warning [10] => The parsed date was invalid.

Watch Out: the Return Value When There Are No Errors

A common pitfall is that the return value changed across PHP versions:

• PHP 5.2 – 8.1: always returns the associative array, with warning_count and error_count set to 0 when nothing went wrong.
• PHP 8.2 and later: returns false (boolean) when the previous date operation produced no warnings and no errors.

This is exactly why you should branch on the result of the date function itself rather than on date_get_last_errors():

<?php
// A valid date — parsing succeeds.
$result = date_create_from_format('Y-m-d', '2022-01-15');

if ($result === false) {
    // This branch is skipped because the date is valid.
    print_r(date_get_last_errors());
} else {
    echo "Parsed successfully: " . $result->format('Y-m-d');
}
?>

Output:

Parsed successfully: 2022-01-15

Because $result is a valid DateTime object, we never call date_get_last_errors() — avoiding the version-dependent false-vs-array surprise entirely.

Practical Debugging Workflow

When handling date parsing in production, follow this pattern to safely capture and log issues:

1. Call the date creation function (e.g., date_create_from_format() or DateTime::createFromFormat()).
2. Check if the result is false.
3. If false, call date_get_last_errors() to inspect the warnings and errors arrays.
4. Log or display the specific warning/error codes and messages to identify the exact parsing issue without halting your application.

Parameters

The date_get_last_errors() function takes no parameters. It simply returns information about the last date-related error or warning that occurred (an associative array, or false on PHP 8.2+ when there were none).

Object-Oriented Equivalent

If you work with the DateTime class instead of the procedural functions, the same information is available through the static method DateTime::getLastErrors():

<?php
$result = DateTime::createFromFormat('Y-m-d', 'not-a-date');

if ($result === false) {
    print_r(DateTime::getLastErrors());
}
?>

Output:

Array
(
    [warning_count] => 0
    [warnings] => Array
        (
        )

    [error_count] => 3
    [errors] => Array
        (
            [0] => A four digit year could not be found
            [10] => Not enough data available to satisfy format
        )

)

This time the string cannot be parsed at all, so the problems are reported as errors (not warnings). DateTime::getLastErrors() returns the identical structure as date_get_last_errors() and follows the same version rules described above.

Related Functions

• date_create_from_format() — parse a date string against an explicit format; the function whose errors you inspect here.
• date_create() — create a DateTime object from a flexible date string.
• checkdate() — validate a Gregorian date before you try to parse it.
• date() — format a timestamp once you have a valid date.

Conclusion

The date_get_last_errors() function is a valuable tool for any PHP developer who needs to troubleshoot date-related errors. By exposing the specific warning or error that occurred during the last date/time operation, it lets you debug parsing problems without halting your application. Remember the two key habits: always branch on the date function's own return value (false), and account for the PHP 8.2+ change where date_get_last_errors() itself returns false when nothing went wrong.

Practice